CVE-2025-12419— Account takeover on OAuth/OpenID-enabled servers
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I. Basic Information for CVE-2025-12419
Vulnerability Information
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Vulnerability Title
Account takeover on OAuth/OpenID-enabled servers
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证算法的不正确实现
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于OAuth状态令牌验证不足，可能导致账户接管。以下版本受到影响：10.12.1及之前的10.12.x版本、10.11.4及之前的10.11.x版本、10.5.12及之前的10.5.x版本和11.0.3及之前的11.0.x版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 10.12.0 ~ 10.12.1 | - |
II. Public POCs for CVE-2025-12419
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Same Patch Batch · Mattermost · 2025-11-27 · 3 CVEs total
| CVE-2025-12421 | 9.9 CRITICAL | Account Takeover via Code Exchange Endpoint |
| CVE-2025-12559 | 4.3 MEDIUM | Information Disclosure in Common Teams API |
IV. Related Vulnerabilities
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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-303
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V. Comments for CVE-2025-12419
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